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Add a generic required_field_trials to FeatureSwitch that takes the
place of a singular field_trial_name. When deciding whether to enable or
disable a feature with field trials, all field trials will be queried
(though short circuiting can occur):
- If user is in "Enabled" group for all field trials, then enable
feature.
- If user is in "Disabled group for any field trials, then disable
feature.
- Otherwise, fall back to default value.

Change the MR FeatureSwitches to depend on the EAR field trial. Per
discussion, we will change the interpretation of MR field trial to
be "X% of users that have EAR field trial enabled".

BUG=541315

Review URL: https://codereview.chromium.org/1680823004

Cr-Commit-Position: refs/heads/master@{#374834}